Brake Chopper And Resistor Installation; Protection - ABB ACS800 Hardware Manual

Brake chopper and resistor installation

The installation instructions for the chopper and resistor are given in NBRA-6xx
Braking Choppers Installation and Start-up Guide [3AFY58920541 (English)]. All
choppers and resistors must be installed outside the drive module in a place where
they will cool.
WARNING! The materials near the brake resistor must be non-flammable. The
surface temperature of the resistor is high. Air flowing from the resistor is hundreds
of degrees Celsius. Protect the resistor against contact.
Use the cable type used for drive input cabling (refer to chapter
ensure the input fuses will also protect the resistor cable. Alternatively, two-
conductor shielded cable with the same cross-sectional area can be used. The
maximum length of the resistor cable(s) is 10 m (33 ft).

Protection

It is highly recommended to equip the drive with a main contactor for safety reasons.
Wire the contactor so that it opens in case the resistor overheats. This is essential
for safety since the drive will not otherwise be able to interrupt the main supply if the
chopper remains conductive in a fault situation.
Below is a simple example wiring diagram.
ACS800
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
L1 L2 L3
OFF
Fuses
1 3 5
2 4 6
U1 V1 W1
1
2
13
3
ON
14
4
Thermal switch (standard
Θ
in ABB resistors)
K1
125
Technical data) to
Resistor braking